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OT: slow RAID speeds

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OT: slow RAID speeds
on Sep 23, 2006 at 10:01:27 pm

I just installed 4 Western Digital WD2500KS SATA 2 drives in my Mac Pro dual 2.66ghz and RAID'd them using disk utility. Problem is I do not think I am getting the speed that these drives should be putting out.

Using Blackmagic Disk Speed Test, testing one single WD2500KS drive I get
a Read rate of 40.5 MB/s and a write of 50.2 MB/s

I then RAID 4 of the same drives and test with same utility and get
a Read rate of 116.0 MB/s and a write of 179.6 MB/s

I used Apple Disk Utility to RAID the drives and selected striped option and
Mac OS Extended (not journaled)

any idea what this read rate is so slow? should it not be roughly 4 times the single drive rate, somewhere around 160 MB/s?

btw the drives did not come with jumpers and I did not use any, just put them in. I have the boot drive connected to the extra SATA2 port on the motherboard, the 4 drives are in the 4 Mac Pro drive sleds.

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